Double reduction-gearing.



K. ALQUIST. DOUBLE REDUCTION BEARING.

APPLICATION FILED IUIEZS. IBIS.

Patented Dec. 28, 1915.

Inventor. Kar-LJN-quist,

l-aw I D Hisijlthorne g.

mwmimxc umnnsmrnS PATENT OFFICE.

mar. ammsr, or scmzlm'cranr, m YORK.

REDUCTION-GEARDVG.

Specification t me Patent.

Application in June 29', 1915. Serial No. 36,961.

The inventionis applicable togearingfor either speed reduction or multiplication but the more general field forspeed reduction and as a matter of convenience the invention is described inoonnection with reduction gearing, but it will be understood that it is not necesarily. limited thereto.

The invention relates more particularlyito;

p d e a hlgh tended to transmit large'loads with double reduction high relatively great speed, reduction.- 7 It comprises a doublerreduction 0 in whichthe drive between the pinion and .the low speed gear is througi two sets of intermediate gear wheels which operatein parallelto transmiththi loal, cinch setcom risinga'high" spd 'w an a ow pi nionmountedinfixedangula tionto each other asby beingfixed on the same shaft, andh inhlgiifih one tlilffewhfils ofeachset,as e speedw 'isin e form of an elastic or flexible wheel. .By this gearingby for a certain power to This is'due .to the fact that in view of the elasticity of the intermediate" wheels it is insured that at all times the load is equallv divided between the two intermediate sets. Further l the sliaft carrying the pinion in line with.

those carrying the intermediate wheels and with piniomthns balanced vbe-= the intermediate elastic elements, the

imon ing thrusts asthe thrusts will be transmitted to andup by the bearings of the inter-' gear-wheels. -Th1s is-of great'ad-' arrangement I am enabled to-decreasef the length of the high speed or pinion and-hence thewidth of face of the,

to smoothness-"of receive no part of the drivpinion. 'The and any torsional deflections or imperfections in the gear teeth will be taken care of by the elastic elements.

iMy invention also comprises a double reductlon gearing in which the number of teeth in the pinion WhQLOf each intermediate set have incommensurate ratios. The Eurpose of this will be explained morefully ereinafter.

In the accompanying drawing Figure 1 is a diagrammatic elevation of a gearing emmy invention; Fig. 2 is a side view of ig. 1; Fig. 3 is'aview similar to Fig. 1 illustrating another arrangement of my invention Fig. 4 is a side elevation and Fig-.5

a. plan view of still another arrangement of.

my invention F ig. 6 is a=more or less diagrammatic view illustrating the 1 arrangement of the intermediate gear-wheels whereby I am enabled to obtain proper meshing of the intermediate gear-wheels with the driving pinion and the driven Referring toFigs. 1 and 2, 10 indicates the high speed pinion and 11. the low wheel, fixed on shafts l2 and 13' respectively. Power is from the one to the other two sets of interhigh Q h 1 d speed speedw ee -14an alow pinion 15 mounte'd-on'the same shaft 16. These h fii i s i e. n g ba l p ,eg -inion10' anced between the two i vheels 14. As will be obvious the arrangement constitutes a doubleireduction gearing. The gearing is preferably'of the double. .or herring-bone type-of helical gearing as such gearing possessns 'eertain'well recognized advantages as rnnmng and other qualities. The high speed-wheels 14 are in the form of elastic or flexible wheels and are preferablyof the double or herringb0ne type of helical elastic gear-wheel invented by -me-andshown specifically in Fig. 7. Sucha gear-wheel comprises a plurality of elastic or flexible lamiuations or plates 18.

rigidly mounted on the shaft or support and having a small clearance space between each two plates near the'periphery as indicated at 18. The face ofthe gear-wheel is provided with helically -'cut teeth which thus are to yield laterally by a slight amount .under the pressure of "the teeth of the coopgear-wheels. This yielding of the Patented Dec. 28, 1915.

speed wheel; and Fig. 7 is a sectional view of a preferred form of elastic gear-wheel.

gear-wheels, each comprising aare elastic and also tothe fact that each plate at its periphery is separated from the othe'rby a small space. These elastic gearwheels as already pointed out yield slightly under tooth pressure to compensate for. n 1y slight inaccuracies in the gearing, and also for any slight inaccuracies in the shaft alinements and make possible the successful use of'the doubleparallel drive 'for trans-' the load. The importance of this-in- "connection with double reduction gearing will be appreciated when it is considered that with such ring an error in the teeth of the low would cause a sudden change in the angular velocity of the pinion, and that the gearwheels on the intermediate-shaft engaging the high speed pinion and low speed wheel would transmit such error magnified in the ratio of the intermediate gear-wheels to each other, were' such' inaccuracy not taken care of by the elastic elements. Also were the inequalities not taken care of-by the elastic elements', the load: would not be equally divided between the gear-wheelsin parallel but there would he points of exce$ive strains on one or the other which would be detrimental to the gearing as is obvious. inequalities are due to the fact that it 1s m practice not posible to get-perfect shape of teeth or1to-get 1the gear shafts absolutely alined sothat the teeth of the high pinion will:mesh properly throughout their length with the wheels on each side-:to obtain an even drive; and inhelical gearing there'is a furtherdiiliculty inilgetting the center distances the respective wheels absolutely equal, which is necessary unless there is some'arrangement to permit of the axial adjustment of the helical gearing as suchgear-wheels have. a perfectl definite relative axial position.

cultia, however, are overcome by m invention since the elastic elements yied sufii cientl to compensate .for 3 an ent quite siimlar arrangem to that of Figs. 1 and 2 is shown, the pinion and intermediate -wheels being ar ranged at the side of the driven wheel rather than'aboveit. Inthis I the same reference numerals are u to designate the parts as amused in-connedrionwith Figs.

1 and2. Inthis andalsoinFigsL- and 2, the shaft 12 is directly in 11112.:W'itl1 shafts 16 thus balancing the pinion 10 between wheels 14.

Figs 4and 5, thegeneral arrangement same -.as. before-except that the low e5 pressure.-

speed. wheel l and the low have been divided, and thelngh 10 and high elastic wheels wheel or high speed pinion -t0o'th, each group has a difierent lines,

pinion 15 v speed In assemblin a ellin -"of this type it is speed pinion bearings n .order to obtain correct meshing of the teeth of the and for thispurpose, I select the gear-wheels 14 and 1556 that the ratios between the number of teeth in them will be incommensurate.

The number of teeth in the intermediate wheels 14 is generally much lar er than the number of teeth in the interm iate pinions 15. If -now I make the number of teeth in each intermediate set such that the number of teeth in the wheels -14 are not evenly divisible by the number of teeth in the pinions 15, the relative angular positions of the teeth will evidently vary around the wheel. The most suitable ratios are those where the number of teeth in-the wheels 14 are one more or one less than an even multiple of the number of teeth in thepinions 15. If these pinions have, say 16 teeth, the wheels 14 may for' instance have 31- or 33 teeth, or

, tion is found where-the error in meshing between the teeth 15 of this other set and the pinion 10 is a and be clearly understood from the fac'tthat when the pinion 15 is shifted-one tooth, the wheel 141s shifted a little bit. more or less than two, three or moreteeth, as the case maybe, andthere'will thus :11 position where wheel '14 will mesh with pin 1011 10 with a very. small error. In this way I can manufacture the wheels and pinions 14 and 15 .without' reference to their relative positions on the shaft. and i rate meshing of the gears. will be-better understood by reference to the diagram shown in Fig. 6. where the'pinion 15 has 24 teeth and the wheel 14-hhs-49 teeth, that is two times 24 plus 1. Every tooth inpinion 15 has .thus a co nding group oftwo teethin wheel. 1-1,. but onaccount of the extra angulal P sition with reference to the correspondgi tooth in pinion 15, as indicated by the do and there isthus one position of the intermediate gear-wheels where the teeth will-closely mesh with the pinion 10 and the wheel 11 and any slight error which still may be found will be taken bility. By this means I avoid an bility of having-to ad'ust the pinion in 0 er to obtain speed meshingoi the gear wheels.

respective gear-wheels,

small enough totaken care of by the flexibility. This.

ways he one y eltisget an accu-" The broad general invention is not claimed herein, as it is claimed in my companion application Serial No. 37,97 9 filed July 3, 1915. r

-In accordance with the provisions of the patent statutes, I have herein set forth the rinciples of my invention and described the Best embodiment thereof at present known to me, but I desire to have it understood that the apparatus shown is only illustrative and that the invention can be carried out by other means.

What I claim as new, and desire to secure by Letters Patent of the United States, is

1. In a double reduction gearing, the combination of a high speed pinion, a low speed wheel, and two sets of intermediate gearwheels arranged in parallel between the pinion and low speed wheel to transmit the load from one to the other, each set comprislllgflil gear wheel having" elastic or flexible tee 2. In a double reduction gearing, the combination of a high speed pinion, a low speed wheel and two sets of intermediate gearwheels ar in parallel between the pinion and the low speed wheel totransmit the load from one to the other, each set com- PllSlIlg two gear-wheels rigidly mounted in fixed angular relation to each other and in' mesh respectively with the highspeed pinion and low speed wheel, the intermediate wheel which is in mesh with the speed pinion having elastic or flexible tee 3. In a double reduction helical gearing, the combination of a high speed pinion, a low speed wheel, and two setsof intermediate gear .wheels arranged between the pinion and the low speed wheel to transmit the load from one to the other, each set comprising ,an elastic or flexible wheel formed of a plurality of lamina or disks clamped together at their central portions and slightly spaced apart at their peripheries so as to becapable of yielding slightly under tooth pres- 4. In ur geanng' the combination of a in inio a wheel to be driven, and a plurahty of 'ving connections between them each comprising a gear-wheel in mesh with said driving pinion and a gear wheel coaxial therewith and in fixed relation thereto in mesh with said wheel to be driven, said latter gear wheels ha in different parts of their peripheries 'fierent angular distances between their teeth that are nearest to angular coincidence.

5. In spur gearing, the. combination of a pmion, a wheel to be driven, and a plurality of connections between them each comprising a gear wheel in mesh with said driving pinion and a gear-wheel co ies or am as may be mama m- .disksclamped Y helical high speed pinion, ahelical low speed bination of a high speed pinion, a lowv speed te wheel, and two sets of mtermedia gearwheels arranged in parallel between the pinion and low speed wheel to transmit the load from one to the other, each set comprising two wheels rigidly mounted in fixed angular relation to each other and in mesh respectively with the high speed pinion and low speed wheel, the intermediate earwheells whichhaarein hrlngzlsh with the h spee pinion '1; e 'c' or flexible teeth and be' on diametrically opposite sides of the high speed pinion.

7. In a double reduction helical gearing, the combination of a high speed pinion, a low speed wheel, and two sets of intermediate gearewheels arranged in parallel between the pinion and low speed wheel to transmit the load from one to the other, each set comprising an elastic or flexible gearwheel formed of a plurality of laminae or together at their central portions and slightly spaced apart at their pe- 'pheries so as to be capable of yielding slightly under tooth p the number of teeth in said flexible gear-wheels bearing an incommensurate ratio to the number of teeth intheothergearsofsaidsets.

8. In spur the combination of a wheel, shafts therefor, two elastic helical gear-wheels in mesh with the pinion and arranged on diametrically opposite sides thereof so that the pinion isfbalanced between them, shaftsfor the elastic gear-wheels, and

'helical gear-wheels in fixed angular relation to said elastic gearwheels and driven from said' last namedshafls which are in mesh.

with the helical low speed wheel.

9. In spur the combination of a shaft, a low helical gear-wheel, comprising two ha ves spaced apart and mounted on fihzlsshacffi; two sets of intermediate ear w ea comp a a h al wheel formed in t iii h alvi ihich are fiaced apart (Z181 said sfhtalft imd mesh with erespective veso eowspee gear and an elastic helical ear wheel mounted on such shaft between said halves; and a high speed helical pinion in mesh with said elastic gear-wheels.

'In witness whereof, I have hereunto set my hand this 28th day of June 1915.

KARL ALQU'IST.

five cents each, by addressing the Ge: of Patents, l M 

